Release Notes: This release updates the command execution to detect
password prompting (i.e. sudo). It merges scp_send and
scp_get into one function (scp), along with some bugfixes. It
moves scp input validation into scp from main, moves most
ssh/rsh/telnet input validation into host_loop from main,
moves the command prompt option setup to its own function
(command_options), and moves ssh_keygen to its own
function (ssh_keygen).